We propose a temporal sampling step prior to spatial augmentation, which can also be viewed as a `temporal augmentation' operation. This is followed by the standard image-based augmentations used in [1]}. Accordingly, given input video \(x\) , we sample two sub-videos \(\tilde{x}_1\)  and \(\tilde{x}_2\) . Next, augmentations are performed on each sub-video to yield \(\tilde{x}^{Aug}_1\)  and \(\tilde{x}^{Aug}_2\) . The augmented sub-videos that are sampled from the same video are considered positive examples, while any augmented sub-video sampled from a different video is considered a negative example. Following we describe the two augmentation steps (temporal and spatial).
